Friction-clutch driving mechanism



Nov. 1, 1927.. 1,647,150 J. KATZMAN FRICTION GLUTCH` DRIVING MECHANISM File dFeb. 1. 192.6

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` UNITED .STATES PATENToFFIcE.

JACOB KATZMAN, OF BROOKLYN, NEW YORK.

FRIc'rIoN-cnUtrcH DRIVINQ MncHANisM.

Application mea February 1, 192s. serial No. 85,236.

tion of a friction clutch driving mec anism,-

in which the parts thereof form a complete unit, adapted to be easily connected to the housings of various electric motors. The second object of the invention is the production of a driving mechanism of very simple construction, with simple parts, that can be easily repaired or replaced. The third object of the invention is the production of a c lutch driving mechanism, by means of whlch a sewing machine can be intermittently operated by means of an electric motor. The fourth object of the invention is to produce a driving mechanism, in which the lubricating means thereof is contained within the same, to avoid the spilling of the lubricating medium on the outside surfaces thereof.

In the accompanying drawings Fig. 1 represents a side elevation partly in axial section of an exemplication of the friction vclutch driving mechanism, with its electric motor and supporting table and Fig.` 2 shows a partial to plan view of Fig. 1.

Referring to the drawings, an electric motor is indicated with the housing 2O having the supporting bracket 21 with the openings 22. The armature shaft of themotor is indicated at 23. A table is shown at 25, and bolts 26 connect the bracket 21 to' said table.

A T shaped bracket comprises the cross member 30, with the depending feet 31, and the longitudinal'member 32 with the depending bifurcated leg 33. A cavity 34 is formed i in the longitudinal member 32. The feet 31 are fastened to the housing 20 by means of the screws 35. An operating lever 1s indil cated with the support-ing arm 40, having with the cylindrical cavityL 47. An adjust-E formed therewith the head 41, and the operating arm 42 with the opening 43. A pin 44 extends from the arm 40.v The arm 40 is pivoted to the bifurcated leg 33 by means of ing screw 48 is in threaded engagement with the boss 46, and has at one end the adjusting plug 49, and at its other end the head 50. A helical spring 52 has one end supported on the pin 44 and its other end is seated in the cavity 34. A chain 54 has one end thereof claim is:

extending through the opening 43 of the arm 42. A brake block 55 is detachably fastened to the head 41, by means of the screw 56.

A discv has formed therewith on one side the hub 61, and on the other side the sleeve 62, having the openings 63. A friction ring 64, preferably of leather, is secured in an annular groove formed in the disc 60. The disc 60 is supported on the armature shaft 23, by means of the screws 66. Fibrous packing 67, to absorb a lubricant is located within the sleeve 62.

A cone pulley is indicated with the annular bearing face 71 at one side and the abutting head 72 at the other side thereof. The said pulley has formed therewith the sleeve 75 which constitutes an vexpansion of the cylindrical cavity 76, for a lubricant77, formed in said pulley. A beltl 78 for the cone pulley 70 extends through openings 80, in the table 25. 4

'The elements of the friction clutch driving mechanism when not transmitting rotation to its cone pulley 70 from the electric motor, are positioned as indicated in the drawings. To transmit rotation to the said cone pulley and thereby to a sewing machine or other mechanism through the belt 78, the operator pulls the chain 54, by means of wlnch lthe adjusting plug149 is caused to bear against the abutting ead 72. By this means the cone pulley 70 slides in' the direction of the arrow A, and the annular bearing face 71 of said pulley is brought into frictional engagement with the adjoining face of the friction ring 64. By this means the rot-ation of the disc 60, which rotates with the arma.-

ture shaft 23 of the electric motor, is transmitted to said cone pulley. While the operator pulls the chain 54, the supportin arm 40 of the operating lever swings up an releases the brake block 55 from its'step of the cone pulley 70. lVhen the chain 54 is released the helical spring 52 automatically swings down the arm 40 and thereby the brake block 55 contacts with its step of the cone pulley 70 and stops the rotation of the latter.

Having described 1n desire to secure by invention what AI etters Patent and 1. In a friction clutch driving mechanism the combination of a rotating *discv having a sleeve extending from one side thereof, a.

cone pulley rotatively supported on the sleeve and adapted to frictionally engage said disc, an operating lever pivoted adjacent to said pulley, a brake block fastened to said lever on one side of its pivot, means to swing said lever on the other side of said pivot, said brake block adapted to engage one of the steps of the pulley, and a plug.

extending from said lever adapted to bear againstsaid pulley to move it in the line of its longitudinal axis in one direction.A

2. In a frictionclutch driving mechanism the combination of a rotating disc having a sleeve extending from one side thereof, a cone pulley rotatively supported on the sleeve and adapted to frictionally engage said disc, a stationary bracket adjacent to said disc, said bracket having a cavity therein, an operating lever pivoted to said bracket, a brake block fastened to said lever on on'e side of its pivotal connection, a chain depending from the lever on the other side of its pivotal connection, said brake block adapted to engage one of the steps of the pulley, a plug extending from said lever adapted. to bear against said pulley to move it in the line of its longitudinal axis in one direction and means interposed between said bracket and lever to move said pulley in an opposite direction. f

3. The combination with a motor of a friction clutch driving mechanism, com yrising a disc fastened to the armature sha of the motor and having a sleeve extending from one side thereof, a friction ring secured to said disc, a pulley rotatively supported on the sleeve, said pulley having a bearing face atone end adapted to bear against said friction ring and having an abutting head at its other end, a bracket extending from the housing of'said motor having a cavity therein and a depending bifurcated leg, an operating lever pivoted to said bracket, a brake block fastened to one end of said operating lever and a chain depending from its other end, said brake block adapted to engage one of the steps of the pulley, a plug adjustably connected to the operating lever and adapted to bear against the said abut-ting head of the pulley and a spring with one end seated in the cavity ot' the bracket and its other end bearing on said operating lever.

Ifn testimony whereof I aiiix my signature.`

oJACOB KATZM'AN. 

